A thesis is submitted for the degree of
Bachelor of Civil engineering
at
The Deakin University
School of Civil Engineering
October 2012

Comparisons of the Hoek-Brown and Mohr-Coulomb

ABSTRACTThis paper describes uses limit equilibrium analyses to produce stability for rock slopes to show the difference between Mohr-Coulomb and Hoek-Brown, in addition, describes the relation between the seismic force and rock slope stability. Currently, the Hoek-Brown failure criterion is widely accepted approach to estimating rock mass strength and it applicability of this criterion is suited to isotropic and homogeneous intact rock, or heavily jointed rock masses. However, for the most geotechnical software applied to rock slopes, still are based on the Mohr-Coulomb failure criterion. The accuracy of using equivalent Mohr-Coulomb parameters to estimate the safety factor in gentle slopes has been investigated. However, no matter steep slopes or low angle rock slopes, using equivalent Mohr-Coulomb parameters to estimate the safety factor will produces poor estimates of safety factors and predictions of failure surface shapes. In order to obtain better equivalent parameter solutions, this paper proposes to use the Hoek-Brown failure criterion to estimating the factor of safety for rock slope. Compare with Mohr-Coulomb failure criterion and Hoek-Brown, the Hoek-Brown provided a quick and accurate way of analysis the rock slope. That can be substitute for Mohr-Coulomb.

Deakin University | ABSTRACT

1

Comparisons of the Hoek-Brown and Mohr-Coulomb

ACKNOWLEDGEMENTSFirst of all, I would like to extend my sincere gratitude to my supervisor, An-Jui Li, for his instructive advice and useful suggestions on my thesis. I am deeply grateful to his help in the completion of this thesis.

I am also deeply indebted to all the other tutors and teachers in Deakin University for their direct and indirect help to me.
Special thanks to my friends who have put their considerable time and effort into their comments on the draft.
Finally, I am indebted to my parents for their continuous support and encouragement.

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